Countersink



(No Model.)

L. K; 87; O. A. WILLIAMS.

GOUNTERSINK.

Patented Feb. 16, 1892.

6AM! JM'MM i 4 UNITED STATES PATENT OFFICE.

LEVI K. WILLIAMS AND CHARLES A. IVILLIAMS, OF CHICAGO, ILLINOIS.

COUNTERSINK.

' SPECIFICATION forming part of Letters Patent No. 468,857, datedFebruary 16, 1892.

Application filed April 27,1891. Serial No. 3901707. (N0 model.)

To all whom it may concern:

Be it known that we, LEVI K. WILLIAMS and CHARLES A. WILLIAMS, citizensof the United States of America, residing at Chicago, in the county ofCook and State of Illinois, have invented certain new and usefulImprovements in Countersinks, of which the following is a specification,reference being had therein to the accompanying drawings, and theletters and figures of reference thereon, forming a part of thisspecification, in which Figure 1 is a side elevation of the counter sinkas it would appear applied to an ordinary twist-drill and adapted tocountersink a seat for a flat bolt or screw head. Fig. 2 is a centralvertical section of the countersink, showing it in areverse positionfrom that shown in Fig. 1 and as it would appear adapted to countersinka seat for an ordinary screw-head. Fig.

3 is a side elevation of the countersink as it would appear applied toan ordinary twistdrill and adapted to countersink a seat for an ordinaryscrew-head. Fig. 4 is an end view of the countersink, showing its endfor cutting a seat for a flat bolt or screwhead; and Fig. 5 is aperspective View of one of. the tubesections of the countersink.

This invention relates to certain improve ments in countersinks adaptedto be applied to an ordinary twist-drill,gi1nlet, or bit forcountersinking the hole either for screwheads orfor fiat bolt or screwheads, and adapted to be adjustable on the drill, which improvements arefully set forth and explained in the following specification and claims.

Referring to the drawings, B is the body proper of the countersink, andconsists of a tube having a screw-4101c in its side for receiving aset-screw S for securing the tool to the bit or drill, and is providedon one end with vertical offsets c, forming cutting-edges for cutting aseat for a fiat-headed screw or bolt, and provided on its oppositetapered end with the serrated cutting-edges r for countersinking a seatfor an ordinary screw-head.

D and E are tubes arranged concentrically within the bore of the tube B,and are pro vided on their ends with similar cutting-edges to those oftube B. These tubes D and E are provided on their sides with screweholesWV, (shown in Figs. 2 and 5,) through which the set-screw S may enter.These holes may be arranged in a longitudinal line or spirally, as shownin Fig. 5, for the purpose of permitting said tubes to be verticallyadjusted in tube B.

When it is desired to simply countersink a hole for an ordinaryscrew-head, the countersink is placed on the drill, as shown in Fig. 3,and held in place by turning up the setscrew S to bring it to bearagainst the drill, as shown in Fig. 2, passing through the tubes D andE, which are provided with screw-holes in line with each other for thatpurpose.

When it is desired to countersink a hole for a flat bolt or screw head,the tool is placed on the drill in the reverse position, as shown inFig. 1, and held in place thereon by the set-screw S in the same manneras shown in Fig. 3.

If the countersink in the hole is to be made so as to have verticaloffsets, the two tubes D and E are extended from tube B, as shown inFig. 1, and held in such position by means of the set-screw S, whichpasses through proper holes in their sides and bears against the drillA, as in the other case.

In case it is desirable to use the device with a larger drill-:say ofthe diameter of the tube E-saidtube can be removed, and so, in case itis desirable to use a drill of the size of tube D, the two tubes D and Ewould then be removed. Any number of such concentric tubes may be used,and thus adapt the tool to be used with any-sized drill or bitcorresponding in size with said tubes. The use of these concentricadjustable and removable tubes constitutes the principal novelty in thisinvention, and we do not wish to be confined to the use of only two suchtubes, as shown in the drawings, as any number may be used as stated.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is as follows, to wit:

1. The countersink shown and described, consisting of the combination ofthe tube B, having the set-screw S, and the tubes D and E, havingdifferent diameters and adapted to be arranged concentrically withintube B, and all said tubes being provided with the cutting-edges c and rand all adapted to op.-

erate substantially as and for the purpose set forth.

2. In combination with a drill or bit, a series ofconcentrically-arranged tubes adapted to have'longitudinal adjustmentwithin and on each other, respectively, and provided on their ends withcountersinking grooves or cutters, substantiall y as and for the purposeset forth.

3. The combination of the tubes B, D, and E, arranged concentrically one'Wifllill the other, the tube B having the set-screw S, and the tubes Dand E having the screw-holes WV for adapting said tubes to havelongitudinal adjustment with each other and with the tube B, and allsaid tubes having the countersinking grooves and cutters c and r,substantially as and for the purpose setforth.

Witnesses:

' O. J. SWAN, L. W. HEss.

